Solid scintillator, radiation detector, and X-ray tomographic imaging apparatus
View Patent ↗The solid scintillator according to the present invention is expressed by the following formula (1): [Formula 1] (M 1-x-y Gd x Ce y ) 3 J 5 O 12 (1) (wherein M is at least one element of La and Tb; J is at least one metal selected from the group consisting of Al, Ga, and In; and x and y are such that 0.5≦x≦1 and 0.000001≦y≦0.2). The transmittance of light having a wavelength of 550 nm measured at a thickness of 2 mm is equal to or greater than 40%. The solid scintillator according to the present invention can be manufactured at low cost, has a high light emitting power, and does not release Cd because Cd is not contained.
1. A solid scintillator represented by the following formula (1):
(Tb 1-x-y Gd x Ce y ) 3 J 5 O 12 (1)
wherein
J is at least one metal selected from the group consisting of Al, Ga, and In; and
x and y are
0.5<x<1 and
0.000001≦y≦0.2,
wherein transmittance of light having a wavelength of 550 nm measured at a thickness of 2 mm is equal to or greater than 40%.
2. A solid scintillator represented by the following formula (2):
(Tb 1-x-y Gd x Pr y ) 3 J 5 O 12 (2)
wherein
J is at least one metal selected from the group consisting of Al, Ga, and In; and
x and y are
0.5<x<1 and
0.000001≦y≦0.2,
wherein transmittance of light having a wavelength of 610 nm measured at a thickness of 2 mm is equal to or greater than 40%.
3. A radiation detector comprising the solid scintillator according to claim 1 .
4. An x-ray tomographic imaging apparatus comprising the radiation detector according to claim 3 .
5. A radiation detector comprising the solid scintillator according to claim 2 .
6. An x-ray tomographic imaging apparatus comprising the radiation detector according to claim 5 .
7. The solid scintillator according to claim 1 , wherein:
0.6≦x<1.
8. The solid scintillator according to claim 1 , wherein:
0.001≦y≦0.1.
9. The solid scintillator according to claim 1 , wherein J is Al.
10. The solid scintillator according to claim 1 , wherein J is Ga.
11. The solid scintillator according to claim 1 , wherein J is In.
12. The solid scintillator according to claim 1 , which is
(Tb 0.3 Gd 0.6 Ce 0.1 ) 3 Ga 5 O 12 .
13. A radiation detector comprising the solid scintillator according to claim 12 .
14. The solid scintillator according to claim 2 , wherein:
0.69≦x<1.
15. The solid scintillator according to claim 2 , wherein:
0.0001≦y≦0.01.
16. The solid scintillator according to claim 2 , wherein J is Al.
17. The solid scintillator according to claim 2 , wherein J is Ga.
18. The solid scintillator according to claim 2 , wherein J is In.
19. The solid scintillator according to claim 2 , which is
(Tb 0.3 Gd 0.6 Ce 0.1 ) 3 Ga 5 O 12 .
20. A radiation detector comprising the solid scintillator according to claim 19 .